LCD Driver Voltage Generation Using Single Resistor-Chain
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Solution Overview
Problem
TFT-LCDs suffer from color shifting phenomena due to differing transmission properties of red, green, and blue lights when using the same Gamma voltage, leading to inaccurate color representation and degraded picture quality.
Innovation Solution
A device and method for driving LCDs using a single resistor-chain to generate pixel driving voltages for three colors, with a multi-selector to choose the appropriate voltage generation unit based on the color, ensuring accurate voltage transmission to the liquid crystal panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If three separate resistor-chains are used to adjust red, green and blue lights respectively, then color accuracy is improved, but device complexity and manufacturing cost increase greatly
Solution Approach 1:
The patent merges three separate resistor-chains into a single shared resistor-chain structure. The voltage generation module uses one common resistor-chain that provides reference voltages for all three color channels (red, green, blue), eliminating the need for three independent resistor-chains while maintaining color accuracy through the multi-selector's intelligent routing of appropriate voltages to each color channel.
Solution Approach 2:
The single resistor-chain is designed to serve multiple functions by generating reference voltages for all three color channels simultaneously. The voltage generation module extracts and provides appropriate reference voltages from this common resistor-chain to red, green, and blue pixel driving circuits through the multi-selector, making the resistor-chain a universal component for all color adjustments.
2Manufacturing precision
If Accurate Color Capture (ACC) solution is used to adjust color levels, then color shifting phenomenon is mitigated, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent extracts the color adjustment functionality from a complex ACC solution framework and implements it through a simplified voltage generation module with a single resistor-chain and multi-selector. This extraction removes the need for complex ACC algorithms and additional functional modules in the timing controller, reducing manufacturing complexity while preserving color accuracy improvement.
3Device complexity
If the same Gamma voltage is used for red, green and blue lights, then device simplicity is maintained, but color shifting phenomenon occurs degrading picture quality
Solution Approach 1:
The patent introduces dynamic voltage selection through the multi-selector component, which dynamically routes different reference voltages from the common resistor-chain to appropriate color channels based on the specific pixel being driven. This dynamic approach allows the system to adapt voltage levels for each color channel individually, achieving color accuracy without requiring three completely separate static resistor-chains.
Data Source
AI summary
The present invention relates to device for driving liquid crystal display (LCD) and method for driving the same. The device for driving LCD comprises a voltage input module for receiving Gamma reference voltage; a voltage generation module connected to said voltage input module, for generating pixel driving voltage of a corresponding color with one resistor-chain, according to the Gamma reference voltage and the color of pixel being driven; and a voltage output module connected to said voltage generation module, for transmitting the pixel driving voltage of said corresponding color to a liquid crystal panel. According to an embodiment of the present invention, voltage generation units that respectively generate pixel driving voltage of three colors are set on one resistor-chain, and a corresponding voltage generation unit is selected by a multi-selector according to the color of pixel being driven, so that the corresponding voltage generation unit transmits the pixel driving voltage to the voltage output module. According to an embodiment of the present invention, color shifting phenomenon is effectively overcome, thus improving TFT-LCD's picture quality.